He is not mentioned per name in Harry Potter and the Half-Blood Prince, but Jo has written that all Hogwarts ghosts attended the funeral of Albus Dumbledore. So I think that we can assume that he, Nearly Headless Nick, the Grey Lady and the Bloody Baron are there, too.
What do you think? Harry granger 20:05, May 16, 2011 (UTC)
Pottermore says that he healed people by touching them with his wand. Does this indicate nonveerbal magic?